Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd83c1317eaa7e9…

MALICIOUS

PDF

52.5 KB Created: 2020-10-25 23:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 611cc2d43c964114827cf59185fcb998 SHA-1: 4beb793753017458ea8fd0c4393cc8a7a8d552e3 SHA-256: 8dd83c1317eaa7e9c8125955c74ea8fe822e3afea48ff4a2a2b698968fd11f65
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/aws?keyword=ts+10th+class+biology+textbook+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f9550b6ae0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f93c622f4188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f86fa4b7d669.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/bevokozit_pibalejuv_nusazubibo.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/misog.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/vegijotu.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/8278019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f953f44c0594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f93e69126390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f8dbf482467b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f8badb78cf1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8fb5c029df3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2951b1-22b3-4eef-b761-3711dae27c02/miwivozediwadobudijiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d86c4a7-eb01-4cc1-a5f0-4688c1957892/becca_fitzpatrick_silence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3524ea3-a9d2-4e17-a4a8-5ee7e93c43db/42959722175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853fd179-bf1d-4483-bebe-5d96390db796/jogudepilexotumas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7189/6741/files/buoyancy_worksheet_middle_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/research_informed_practice_social_work.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8182/9025/files/5930285508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8878/2505/files/delfin_arbeitsbuch_antworten.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9163/1522/files/gizimisivozi.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/babosurubejovekaxujez.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/lajivezovuvik.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/bobezupevonat.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/43090163366.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/biopsicologia_pinel_capitulo_3.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7978 5932 bytes
SHA-256: 0794c50b20d864a60a35ae0855e45f19c52fbeb64f95c51b369cdfaff4db2e5d
font_01_sfnt_off00008dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBD 5284 bytes
SHA-256: 7a40b92144d82ecc9ef0d84a436a2a8c9421476467826fd739af2696fc5e32ab
font_02_sfnt_off00009f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F68 10520 bytes
SHA-256: b95eb7616f8e98484c9dcac3a605c32d79c45ee09c69bcd26e05ee9a8b039804